Tertiary xanthates



Patented Apr. 19, 1932 UNITED STATES LUDWIG ROSENSTEIN, OF

SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO SHELL DEVEL- OIMENT COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF DELA- WARE No Drawing.

My invention relates to certain new xanthates of tertiary alcohol. These xanthates are useful as in flotation processes, for insecticides and as vulcanizing accelerators.

It is the object of my invention to provide certain xanthates of tertiary alcohols which have not heretofore been available.

In the literature will be found descriptions of several processes for producing the xanthates of primary alcohols. However, the production of xanthates of tertiary alcohols has not been efiected since the previously known processes are not suitable for their production. In accordance with my invention I have produced certain xanthates of tertiary mono-hydric alcohols such as tertiary butyl alcohol.

In the following specification I shall point out the manner of forming the tertiary alcohol xanthates. It is to be understood that the invention, as defined by the claims, is to be accorded a range of equivalents consistent with the state of the prior art.

In forming the potassium xanthate of tertiary butyl alcohol I have preferably proceeded by first grinding potassium hydroxide to a fine powder. The hydroxide was then added to the tertiary butyl alcohol in substantially molecular proportions. A molec- 30 ular quantity of carbon disulphide was then added and the mixture was heated under a reflux condenser at about the boiling point of the mixture. The heating is preferably con tinued for some little time to insure that a reasonable amount of the potassium tertiary butyl xanthate is formed. As the reaction proceeds the white alcoholate changes to the vellow xanthate which may be separated out O bv filtering when the heating: is discontinued.

This xanthate I have found upon analysis to be potassium tertiary butyl xanthate.

In forming the sodium xanthate of the tertiarv butyl alcohol I have found that the alcohol is preferably first contacted with finely divided metallic sodium. After the sodium Cal Application filed November 11, 1929. Serial No. 406,513.

had reacted with the alcohol, carbon disulphide in substantially molecular proportions was added, whereupon the sodium alcoholate was transformed into the sodium xanthate. This xanthate was found upon analysis to be sodium tertiary butyl xanthate.

I claim:

1. As a new compound: an alkali-metal Xanthate of a tertiary monohydric aliphatic alcohol.

2. As a new compound: an alkali-metal xanthate of tertiary butyl alcohol.

8. As a new compound: the sodium xanthate of a tertiary monohydric aliphatic alcohol.

4:. As a new compound: sodium tertiary butyl xanthate.

5. As anew compound: potassium tertiary butyl xanthate.

6. As anew compound: the potassium xanplhzite of a tertiary monohydric aliphatic alco- In testimony whereof, I have hereunto set my hand.

LUDWIG ROSENSTEIN. 

